參數(shù)資料
型號(hào)： MC68HC11K4VFU4
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： Technical Summary 8-Bit Microcontroller
中文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 64/80頁(yè)
文件大?。?/td> 420K
代理商： MC68HC11K4VFU4
MOTOROLA
64
M68HC11 K Series
MC68HC11KTS/D
10 Main Timer
The timing system is based on a free-running 16-bit counter with a four-stage programmable prescaler.
A timer overflow function allows software to extend the timing capability of the system beyond the 16-
bit range of the counter.
The timer has three channels for input capture, four channels for output compare, and one channel that
can be configured as a fourth input capture or a fifth output compare. In addition, the timing system in-
cludes pulse accumulator and real-time interrupt (RTI) functions, as well as a clock monitor function,
which can be used to detect clock failures that are not detected by the COP.
Refer to
11 Pulse Accumulator
and
10.1 Real-Time Interrupt
for further information about these func-
tions. Refer to the following table for a summary of the crystal-related frequencies and periods.
Table 10 Timer Summary
Control Bits
Common System Frequencies
12.0 MHz
3.0 MHz
Main Timer Count Rates (Period Length)
Definition
XTAL
E
8.0 MHz
2.0 MHz
16.0 MHz
4.0 MHz
PR[1:0]
0 0
1 count —
overflow —
500 ns
32.768 ms
333 ns
21.845 ms
250 ns
16.384 ms
1/E
2
16
/E
0 1
1 count —
overflow —
2.0
μ
s
131.07 ms
1.333
μ
s
87.381 ms
1.0
μ
s
65.536 ms
4/E
2
18
/E
1 0
1 count —
overflow —
4.0
μ
s
262.14 ms
2.667
μ
s
174.76 ms
2.0
μ
s
131.07 ms
8/E
2
19
/E
1 1
1 count —
overflow —
8.0
μ
s
524.29 ms
5.333
μ
s
349.52 ms
4.0
μ
s
262.14 ms
16/E
2
20
/E
RTR[1:0]
0 0
0 1
1 0
1 1
Periodic (RTI) Interrupt Rates (Period Length)
4.096 ms
8.192 ms
16.384 ms
32.768 ms
21.845 ms
2.731 ms
5.461 ms
10.923 ms
2.048 ms
4.096 ms
8.192 ms
16.384 ms
2
13
/E
2
14
/E
2
15
/E
2
16
/E
CR[1:0]
0 0
0 1
1 0
1 1
COP Watchdog Timeout Rates (Period Length)
16.384 ms
65.536 ms
262.14 ms
1.049 s
699.05 ms
10.923 ms
43.691 ms
174.76 ms
8.192 ms
32.768 ms
131.07 ms
524.28 ms
2
15
/E
2
17
/E
2
19
/E
2
21
/E
Timeout Tolerance
(–0 ms/+...)
16.4 ms
10.9 ms
8.192 ms
2
15
/E
相關(guān)PDF資料
PDF描述
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